Abrasive expansion reamer



Feb. 6, 1923. 11,444,763

J. A. BERTRAND ABRASIVE EXPANSION REAMER v Filed Mar. 15, 1921 JahnBarf/2nd INVENTOR.

ATTORNEY.

Patented Feb. 6, 1923.

JOHN A. BERTRAND,- OF LOS ANGELES, CALIFORNIA,

PATENT OFFICE.

assrenon, BY manor AND MESNE ASSIGNMENTS, 0F ONE-HALF TO ASBURY REED, 0]LOS ANGELES, CALI- ronma', AND ONE-HALF To ronma.

WEI-INER A. KOCH, OF SAN FRANCISCO, CALI- ABRASIVE EXPANSION REAMEB.

Application filed March 15,'-1921.

To all whom it may concern.

Be it known that I, JOHN A. Bnn'rnaxn, a citizen of the United States,residing at Los Angeles, in the county of Los Angeles and State ofCalifornia; have invented new and usefulImprovements in AbrasiveExpansion Reamers, of which the following is a specification.

It is the object of this invention to provide-an abrasive rea-mer havingmeans for readily expanding the circumference defined by the abrasivematerlal.

It is a still further object of the invention to provide areainer havinga readily expandible and contract-able guide slee e which carriesdetachable plugs of abrasive material. v

The invention will be readily understood from the following descriptionof the accompanying drawings, in which Figure 1 is a side elevation of areamer constructed in accordance with the invention.

Fig. 2 is a longitudinal section on the line 2-2 of Fig. 1.

Fig. 3 is a transverse section on the line 3-3 of Fig. 1.

The reamer includes a mandrel which is formed with a tapering portion 1and end projections 2 and .3, one of which is threaded as shown at 4 inorder to receive a usual coupling. while the other end projection 2 ispreferably provided with a flattened surface portion 5 in order that itmay be readily engaged bya wrench.

A guide sleeve 6 is received upon the tapering portion 1 of the entiresurface of this guide sleeve forms a tapering bore co-operating with thetaper of the mandrel. The guide sleeve is of somewhat resilient materialand is arrange for expansion and contraction by providing series ofslots 7 and 8 extending lengthwise of the guide sleeve from therespective ends thereof. The slots terminate short of the opposite endsof the guide sleeve and are preferably provided with circularenlargements 9 at their inner ends. By this arrangement it will be seenthat the guide sleeve may be readily expanded and contracted upon themandrel by adjusting the sleeve longitudinally of the tapering portionof the mandrel so as to cause engagemandrel, and the d the mandrel tofully guide sleeve.

Serial No. 452,617.

ment between the co-operating tapering surfaces of the mandrel and guidesleeve.

In order to prevent rotary the guide sleeve upon the mandrel whilepermitting of longitudinal adjustment of the sleeve, keys 10 are pre themandrel and are received within either slots 7 or 8 of the guide sleeve.In order to longitudinally shift the guide sleeve, the latter ispreferably provided with an inturned flange 11 at its larger end andreceived around the end projection 3 of the mandrel. A nut 12 isthreaded on to the end project-ion 3 of the mandrel so as to impingeagainst flange 11 and thus provide forlongitudinal adjustment of theguide sleeve. The nut 12 may be provided with suitable apertures 13adapted to be engaged by a tool for rotating the nut.

The guide sleeve of the reamer carries a plurality of plugs of abrasivematerial which are preferably readily detachable from the guide sleeveand replaceable when worn. For this purpose a plurality of apertures 15is provided in the guidesleeves, and plugs 16 of suitable abrasivematerlal are received in these apertures so as to ject radially beyondthe guide sleeve. The plugs are preferably provided with enlargements 17at their inner ends which are received within at the inner ends ofapertures 15 so as to hol the plugs against radial displacement andpermit of the ready removal and renewal of the same when the guidesleeve is removed from the mandrel.

In order to readily remove the expandible guide sleeve from the taperingmandrel after the completion of a piece of work and when the sleeve hasbeen forced down tightly upon expand the sleeve, a nut 19 is preferablythreaded upon the large end of the tapering mandrel projects somewhatbeyond the end of the It will thus be seen that by screwing nut 19 ontothe mandrel, the guide sleeve may be forced from the same.

Itjwill thus be seen that I have provided an extremely simple butefficient abrasive reamer wherein a guide sleeve carrying the abrasivematerial is adapted to be readily expanded as the reaming continues.Various changes may be made without movement of prothe countersunkportions 18.

which I departing from the spirit of the invention as claimed.

What is claimed is:

1. A reamer including a mandrel, an expandible guide sleeve mountedthereon, said sleeve being provided with a plurality of apertures, plugsof abrasive material removably mounted in said apertures so as toproject radially beyond the sleeve, and means for expanding andcontracting said sleeve.

2. A reamer including a mandrel, a guide sleeve mounted thereon andhaving longitudinal slots spaced circumierelltially to permit of uniformexpansion and contraction of said sleeve, keys carried by said mandreland received in said slots for locking the latter against rotatlonalmovement on the mandrel, abrasive plugs mounted in the sleeve betweensaid-slots, and means for expanding and contracting said sleeve.

3. A reamer comprising a. mandrel, an expansible sleeve mounted thereonand having openings therein. and abrasive plugs fitted within saidopenings, and means for locking the plugs against displacement from theopenings.

l. A reamer comprising a mandrel, an expansible sleeve-mounted thereonand having openings formed therein, plugs fitted within said openings,and flanges carried by the plugs and adapted to be interposed betweenthe mandrel and sleeve for locking the plugs within the openings.

lln testimony whereof I have signed my name to this specification.

JOHN A. B ERTRA NI). 7

